| article html file updated | 6 February 2020 07:10 CET | Update | https://www.mdpi.com/2073-4360/6/2/423 |
| article html file updated | 7 May 2019 18:50 CEST | Update | - |
| article html file updated | 21 March 2019 12:07 CET | Update | - |
| article html file updated | 19 August 2015 19:50 CEST | Original file | - |
| article pdf uploaded. | 10 February 2014 10:55 CET | Version of Record | https://www.mdpi.com/2073-4360/6/2/423/pdf |
